Pyxidium tardigradum Van der Land, 1964 Dataset GBIF Backbone Taxonomy Rank SPECIES Classification kingdom Chromista phylum Ciliophora class Oligohymenophorea order Peritrichida family Operculariidae genus Pyxidium species Pyxidium tardigradum Name Homonyms Pyxidium tardigradum Van der Land, 1964